The first step is to ensure that your speeds are adequate. To do so, the reps will need a few speed tests to be run, and in a specific way, but please only run the tests if you have plan data. If you are out of plan data, please reply indicating that, as tests run while out of data won't be of value for this issue. The instructions for running the tests are here. Please be sure to read them thoroughly before running the test and follow the directions. If you run any upload tests, there is a discrepancy between the main page instructions and the "in depth guide". You can use the 3MB file size for upload tests.
After you've run some tests, please post your testmy.net "My Results" page URL so that the reps can view the results.
I understand, but the reps here will still need a few tests run as outlined. In addition to the speed itself, they can often glean other important information from the results.
In that case I would wait to see what a rep has to say. Though your phone may be able to be used for the tests, WiFi adds another possible source of problems in to the mix, so devices connected to it generally can't be relied on to give a base speed.
The reps are on M-F from approximately 9AM to 6PM EST. They usually reply within a day, but with them being much busier over the last couple of weeks it may take them a bit longer than normal. Hopefully it will be tomorrow, though.
Edit: If you can borrow a LAN cable connectible laptop from school that would probably help, though a rep may still be able to help you without it. The thing I'm a little concerned with is tomorrow being Friday, as help may not be available until at least Monday. Again, though, hopefully they'll reply tomorrow and possibly offer a solution, or at least start the process toward it.
<a href="https://testmy.net/compID/61847578591">61847578591's Speed Test Results</a><iframe loading="lazy" src="https://testmy.net/compID/61847578591&f=1" scrolling="no" frameborder="0" height="380" width="100%"></iframe>